During his 34-year career Mokwa served in almost every unit of the Department. His first assignment as a patrol officer was in the Fifth District. He worked in the Fourth, Fifth, Sixth and Ninth Districts as an officer and as a supervisor. As an investigator he worked in the District Detective Bureau as well as the Intelligence Unit and the Internal Affairs Division. Prior to being promoted to Chief of Police, he served as the Assistant Chief of Police, responsible for the Bureau of Professional Standards, which includes the Internal Affairs, Police Academy, Information Services (Technology) and Special Services Divisions. After he retired from the Department, he attained his second Masters degree from Webster University in therapy and counseling. He was a therapist until 2023.
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